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KTL KTL is offline
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Join Date: Sep 2000
Location: Frankfort IL USA
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Note that the ARPs have been known to show loosening after installation. Some have found the use of their moly lube under the head of the nut contributes to this. The Supertecs stick good right from installation (no re-torquing required) and maybe it's on account of the serrated flange nut (actually a 928 rod bolt nut) biting into the precision ground thick washer?

Also note that the last of the naturally aspirated air cooled engines use all steel studs. The 964 engine is originally equipped with all dilivar (not the 993TT all-thread) and then the 993 came along with steel and then the 993TT uses the all thread. Basically Porsche was all over the place with their usage of head stud types.

A large number of people have used all plain steel on the naturally aspirated engines for a lot of years and no bad results. Lastly, if you plan on getting all new hardware as well? The Supertec studs are a great value. If you check Pelican's pricing on a set of steel studs, new washers and new barrel nuts? You're very close to the price of the Supertec stud kit. Just make sure the Supertec kit includes a thread forming tap for the case, which shapes the case threads to the same thread fit (same pitch as original- M10x1.5) as the precision studs.
Kevin L
Present: '86 Carrera, '79 911SC widebody conversion rolling racecar shell
Past: '87 Carrera
Old 04-30-2018, 01:04 PM
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